Differences

This shows you the differences between two versions of the page.

--- en:c2_hardware_1w [2016/02/29 14:13]
ck.kim
+++ en:c2_hardware_1w [2017/05/04 20:22] (current)
odroid
@@ Line 1: / Line 1: @@
-===== Dallas 1-Wire Support =====
+====== Dallas 1-Wire Support ======
   * Support for Dallas 1 Wire is included on Kernel 3.14.29-29 and upwards. Make sure you are updated.
   * Will cover an example of a temperature sensor well known **DS1820** other 1 wire IC's are supported too.
+<WRAP left round tip 70%>
+You have to check **/etc/modprobe.d/w1_gpio.conf** file to enable the 1-wire driver.
+</WRAP>
+\\
+\\
+\\
+\\
+\\
+\\
-Default GPIO for 1-Wire is **Pin #7 (GPIOX_21, GPIO113)**
+Default GPIO for 1-Wire is **Pin #7 (GPIOX.BIT21)**
   * **Connection: With External-Supply**
@@ Line 12: / Line 21: @@
 Pin 1 (Left): Ground (-)
-Pin 2 (Middle): Pin #7 C2 (GPIOX_21, GPIO113)
+Pin 2 (Middle): Pin #7 C2 (GPIOX.BIT21)
 Pin 3 (Right): VCC (3.3V)
@@ Line 23: / Line 32: @@
 Pin 1 (Left): Ground (-)
-Pin 2 (Middle): Pin #7 C2 (GPIOX_21, GPIO113)
+Pin 2 (Middle): Pin #7 C2 (GPIOX.BIT21)
 Pin 3 (Right): Ground (-)
@@ Line 30: / Line 39: @@
   * Load the required kernel modules: <code>modprobe w1-gpio && modprobe w1-therm</code>
-  * Check if your sensor is working: <code>root@odroid:~# cd /sys/bus/w1/devices/
+  * Check if your sensor is working: <code>odroid@odroid64:~$ cd /sys/bus/w1/devices/
-root@odroid:/sys/bus/w1/devices# ls
+odroid@odroid64:/sys/bus/w1/devices# ls
 -000802f41d67  w1_bus_master1
-root@odroid:/sys/bus/w1/devices#</code>
+odroid@odroid64:/sys/bus/w1/devices#</code>
-As you can see my sensor is detected as **10-000802f41d67**, each sensor has a different id. So yours will be different.
+As you can see my sensor is detected as **10-000802f38c57**, each sensor has a different id. So yours will be different.
-  * Read the temperature:<code>root@odroid:/sys/bus/w1/devices# cd 10-000802f41d67
+  * Read the temperature:
-root@odroid:/sys/bus/w1/devices/10-000802f41d67# cat w1_slave
+<code>
+odroid@odroid64:/sys/bus/w1/devices$ cd 10-000802f38c57
+odroid@odroid64:/sys/bus/w1/devices/10-000802f38c57# cat w1_slave
 00 4b 46 ff ff 03 10 30 : crc=30 YES
 00 4b 46 ff ff 03 10 30 t=25562
-root@odroid:/sys/bus/w1/devices/10-000802f41d67#
+odroid@odroid64:/sys/bus/w1/devices/10-000802f38c57#
 </code>
@@ Line 52: / Line 63: @@
 <code>
-root@bigsmall:/sys/bus/w1/devices# ls
+odroid@odroid64:/sys/bus/w1/devices# ls
--000802f37119  10-000802f41d67  w1_bus_master1
+-000802f38c57  10-000802f41d67  w1_bus_master1
 </code>
 Two sensors in parallel.
-Change the Default GPIO pin for 1-Wire interface** \\
+====== Change the Default GPIO pin for 1-Wire interface ======
-Ex) Default GPIO pin change to GPIOX_19(GPIO111)
+Ex) Default GPIO pin change to GPIOX.BIT19 \\
+Please refer to below links for details related to gpio mapping in the device-tree.\\
+[[https://github.com/hardkernel/linux/blob/odroidc2-3.14.y/include/dt-bindings/gpio/gxbb.h | C2 gpio mapping in the device-tree]] \\
 <code>
 odroid@odroid64:~$ sudo apt-get install device-tree-compiler
 odroid@odroid64:~$ fdtget /media/boot/meson64_odroidc2.dtb /onewire gpios
  113 0
-odroid@odroid64:~$ fdtput /media/boot/meson64_odroidc2.dtb /onewire gpios 31 111 0
+odroid@odroid64:~$ fdtput /media/boot/meson64_odroidc2.dtb /onewire gpios 18 111 0
 odroid@odroid64:~$ fdtget /media/boot/meson64_odroidc2.dtb /onewire gpios
  111 0
 odroid@odroid64:~$ sudo reboot
 </code>
+If the reboot doesn't affect the dtb update, you need a hard reset(power off/on).\\
-DS1820 change to connection Pin #11
+**Use the first number in the fdtget command output when you run fdtput command. For example, 18(0x12) is the GPIO group number.**
+DS1820 is connected to Pin #11
 Pin 1 (Left): Ground (-)
-Pin 2 (Middle): Pin #11 C2 (GPIOX_19, GPIO111)
+Pin 2 (Middle): Pin #11 C2 (GPIOX.BIT19)
 Pin 3 (Right): Ground (-)